Answer:
1. Most of my study time is spent on Statistics. It's my toughest class.
Most of my study time is spent on Statistics, and it's my toughest class.
2. The little girl seemed to be lost. She was crying and looking for her mother.
The little girl seemed to be lost, and she was crying and looking for her mother.
3.
4.Koala bears are not actually bears. They are marsupials.
Koala bears are not actually bears, and they are marsupials.
5. I always wake up late. I just drink milk then I go to school.
I always wake up late, and I just drink milk then I go to school.
Explanation:
Parang bitin yung sentence sa 3